I've had several tries with this...none of them good.
Although I hate to admit this, most of the problems were from those that were raised naturally, with hens sitting on their fertile eggs. I guess it was a problem with irregular temperature control. However, for these chicks, they were never able to feed/drink properly, so I was forced to euthanize them, which was very, very upseting.
Then i got a batch of 500 chicks from a commercial hatchery, and one of those had a deformed leg. I tried everything I could to try to fix the problem, but nothing worked.
Because she had a deformed leg, I kept her separate from the others, except with a couple of "friends" for company, and she did OK. I kept so much food in that area that there was no competition for food, but she never grew well, and was always hiding off in a corner. By 3 months of age, she was less than half the size of the other birds, despite food ALWAYS being available and in several different places.
She just eventually died from "failure to thrive". Probably, if I hadn't taken such "heroic" measures, she'd have died in days-weeks of being hatched.
Anyway....I hope you have better luck than I did, and if your chick's leg is broken...it CAN be fixed.
Rachel
Bellecreek Farm, TX